Smoke-consuming device for furnaces.



G. W. LUPTON. SMOKE CONSUMING DEVICE FOR FURNACES.

APPLICATION FILED DEC. 10, 1912.

Patented Aug. 12, 1913.

Fl E15.

CYRIL WEST LUPTON, OF BRADFORD, ENGLAND.

SMOKE-GONSUMING- DEVICE FOR FURNACES.

Specification of Letters Patent.

Patented Aug. 12,1913.

Application filed December 10, 1912. Serial No. 736,005.

To all whom it may concern:

Be it known that I, CYRIL Wnsr LUPTON,

a subject of the King of Great Britain, re-

siding at Bradford,- Yorkshire, England, have invented certain new and useful Improvements in Smoke- Consuming Devices for Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in smoke consuming devices for boiler lines of the type in which a number of tubes of refractory material are arranged in'the furnace flue so that the furnace gases may pass through them and are supplied with fresh air to complete the combustion of these gases, the fresh air being admit-ted through holes in the sides of the tube. v

The object of the present invention is to more thoroughly intermix the incoming air with the furnace gases as they pass through the tubes by producing a whirling effect in the tubes and to delay the gases and air as they are being mixed in their passage through the tubes so as to keep them in contact with a highly heated refractory material for an increased length of time.

A further object of the invention is to arrange a smoke consuming device of the present type so that it does not appreciably detract from or lessen the heated surface of the boiler flue. This is obtained by arranging a free passage between the top of the refractory tubes and the top of the boiler flue.

A further object is to keep the gases, not only those which pass through the tubes but also those which pass over the tubes, in contact therewith for an increased time by giving the tubes a certain inclination from toward the front of the furnace toward the back of the flue.

The invention is described in the accompanying drawings in which:

Figure 1 is a side elevation in section showing a boiler flue with the present invention arranged in a manner suitable for a hand fed furnace. Fig. 2 is a sectional end elevation of Fig. 1. Fig. 3 is a side elevation in partial section showing the present invention as applied to an automatically stoked boiler. Fig. 4115 a sectional end view of Fig. 3. Fig. 5 is a transverse section through one of the pipes shown in Fig. 2.

In accordance with the invention as applied to a hand fed boiler as shown in Fig. 1 there are threetubes a of refractory material provided which rest with their forward ends on the usual bridge I) or on suitable brick work 0? on the bridges, which is arranged, in accordance with the usual construction, to the rear of the grate p. The outer pipes are of such a size as to rest against or be supported by the flue sides or by the brick 'work arranged against the flue sides while the third pipe rests either upon the first two pipes or on the brick work which is used to fill up the space between it and the top of the bridge. The

back ends of the pipes are supported by a suitably arranged wall 0 so as to give them a certain inclination downward from their front ends to their back ends. On the other hand the spaces bounded by the flue, the periphery of the upper sides of the pipes and the outer sides of the pipes are left free. Below the bridge there is arranged a suitable damper e which can be operated by suitable means f so as to regulate the amount of air admitted to the space 9 under the pipes at. 'These pipes have as shown more especially in Fig. 5 inclined or oblique orifices 71, for admission of air to the interior and are so arranged that fresh air entering the chamber 9 will pass into the pipes through some of these holes.

In the arrangement shown in Fig. 3 for a mechanically stoked furnace the pipes at cannot rest on the bridge I) owing to the ashpit Z. They are therefore arranged somewhat behind the bridge I) with their front ends resting on a wall 70 and their rear ends resting on the wall 0 in such a way as to give them a certain inclination downward from their front ends to their back ends as in the arrangement shown in Fig. 1. Through the wall 0 however the pipe m is inserted to admit air to the space between the two walls 70 and 0 so that fresh air can enter through the lateral holes in the pipes a as in the previously described case. The pipes are preferably tapered or flared somewhat at their front ends as at j in Fig. 8.

It will be appreciated that the burnt gases andthe products of combustion given off by the furnance will pass some of them through the pipes a and some of them over the pipes and will raise the same to a very high temperature. The additional air supply will pass either past the damper e or by the pipe on up through the orifices 71 into the pipes. In passing through into the pipes this air is very strongly heated and on entering the pipes it meets the furnace gases and causes the inflammable portion of the same to burn \ery fiercely so that all the smoke and grit which would otherwise pass up the chimney is thoroughly consumed. Owing to the inclination or obliqueness given to the holes h the air will enter the pipes with a whirling motion and so will thoroughly mix with the furnace gases and thus greatly assist in the tl'iorough combustion of the same.

The pipes in the preferred form as shown are about 2 feet in length and the inclination imparted to them is about 4L inches in their whole length. The pipes are constructed from fireclay or from a mixture which is known in the trade as ganister or from other refractory material. If desired instead of the pipes or tubes described passages may be constructed from plates built to form the equivalent of the tubes whether triangular, rectangular or inultiangular in cross section.

I declare that what I claim is 1. In a furnace flue, tubes arranged longitudinally to provide a passage for the furnace products and leaving a secondary passageway above said tubes said tubes having apertures therein respectively in con1n1unication with a source of air supply and the passageway above said tubes.

2. In a furnace flue, tubes arranged at an incline longitudinally to provide a passage therethrough for the furnace products, and 40 forming with the roof of the flue a secondary passageway of increasing area from the front to the rear, said tubes having apertures therein respectively in communication with a source of air supply and the passageway above said tubes.

3. In a furnace flue tubes arranged at an incline longitudinally to provide a passage therethrough for the furnace products, a secondary passageway formed between said tubes and the roof of the flue and being of increasing area from the front to the rear, said tubes having apertures therein respectively in communication with a source of air supply and leading to the passageway above said tubes, the air-supply apertures adapted to admit air at rightangles to the direction of passage of the furnace products and being inclined with respect to the radii of the tubes whereby to set up a rotary motion in the products about the axis of the tubes.

In testimony whereof, I affiX my signature, in presence of two witnesses.

Hnnnm: PUMPI-IREY, HERBERT LISTER.

Copies of this patent mas be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

